EP4011018A1 - Libération de ressource de retransmission sur la base d'un harq-ack - Google Patents

Libération de ressource de retransmission sur la base d'un harq-ack

Info

Publication number
EP4011018A1
EP4011018A1 EP20875121.4A EP20875121A EP4011018A1 EP 4011018 A1 EP4011018 A1 EP 4011018A1 EP 20875121 A EP20875121 A EP 20875121A EP 4011018 A1 EP4011018 A1 EP 4011018A1
Authority
EP
European Patent Office
Prior art keywords
resource
data unit
wireless device
sidelink
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20875121.4A
Other languages
German (de)
English (en)
Other versions
EP4011018A4 (fr
Inventor
Youngdae Lee
Giwon Park
Hanbyul Seo
Jongyoul LEE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP4011018A1 publication Critical patent/EP4011018A1/fr
Publication of EP4011018A4 publication Critical patent/EP4011018A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

Definitions

  • the present disclosure relates to clearing a retransmission resource based on hybrid automatic repeat request acknowledgment (HARQ-ACK).
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications.
  • 3GPP 3rd generation partnership project
  • LTE long-term evolution
  • Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity.
  • the 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.
  • ITU international telecommunication union
  • NR new radio
  • 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process.
  • ITU-R ITU radio communication sector
  • IMT international mobile telecommunications
  • the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.
  • the NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc.
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type-communications
  • URLLC ultra-reliable and low latency communications
  • the NR shall be inherently forward compatible.
  • V2X communication is the passing of information from a vehicle to any entity that may affect the vehicle, and vice versa. It is a vehicular communication system that incorporates other more specific types of communication as vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-device (V2D) and vehicle-to-grid (V2G).
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network
  • V2V vehicle-to-vehicle
  • V2P vehicle-to-pedestrian
  • V2D vehicle-to-device
  • V2G vehicle-to-grid
  • An aspect of the present disclosure is to provide a method and apparatus for clearing a retransmission resource based on hybrid automatic repeat request acknowledgment (HARQ-ACK).
  • HARQ-ACK hybrid automatic repeat request acknowledgment
  • An aspect of the present disclosure is to provide a method and apparatus for clearing a retransmission resource and flushing a buffer of HARQ process upon receiving an acknowledgement in response to transmission of MAC PDU.
  • a method performed by a first wireless device configured to operate in a wireless communication system includes transmitting, to a second wireless device, a data unit by using a first resource in a hybrid automatic repeat request (HARQ) process, receiving an acknowledgement (ACK) in response to the data unit, clearing a second resource to be used for retransmission of the data unit, and flushing a buffer of the HARQ process.
  • HARQ hybrid automatic repeat request
  • an apparatus for implementing the above method is provided.
  • the present disclosure can have various advantageous effects.
  • a UE can efficiently utilize resources for sidelink retransmissions based on HARQ feedback.
  • a UE can perform resource reselection for retransmissions based on HARQ feedback for sidelink transmissions, in particular when retransmission resources are reserved for the packet.
  • a system can provide efficient use of resources for a UE performing resource reservation for retransmissions.
  • FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.
  • FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.
  • FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.
  • FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.
  • FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.
  • FIGs. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.
  • FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.
  • FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.
  • FIG. 10 shows an example of a method performed by a first wireless device (e.g., transmitting (TX) wireless device) configured to operate in a wireless communication system to which implementations of the present disclosure is applied.
  • a first wireless device e.g., transmitting (TX) wireless device
  • TX transmitting
  • FIG. 11 shows an example of performing data transmission by a UE to which implementations of the present disclosure is applied.
  • FIG. 12 shows an example of sidelink data transmission of a MAC PDU from a UE to which implementations of the present disclosure is applied.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • MC-FDMA multicarrier frequency division multiple access
  • CDMA may be embodied through radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be embodied through radio technology such as global system for mobile communications (GSM), general packet radio service (GPRS), or enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be embodied through radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or evolved UTRA (E-UTRA).
  • IEEE institute of electrical and electronics engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • E-UTRA evolved UTRA
  • UTRA is a part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA.
  • 3GPP LTE employs OFDMA in DL and SC-FDMA in UL.
  • LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.
  • implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system.
  • the technical features of the present disclosure are not limited thereto.
  • the following detailed description is given based on a mobile communication system corresponding to a 3GPP based wireless communication system, aspects of the present disclosure that are not limited to 3GPP based wireless communication system are applicable to other mobile communication systems.
  • a or B may mean “only A”, “only B”, or “both A and B”.
  • a or B in the present disclosure may be interpreted as “A and/or B”.
  • A, B or C in the present disclosure may mean “only A”, “only B”, “only C”, or "any combination of A, B and C”.
  • slash (/) or comma (,) may mean “and/or”.
  • A/B may mean “A and/or B”.
  • A/B may mean "only A”, “only B”, or “both A and B”.
  • A, B, C may mean "A, B or C”.
  • At least one of A and B may mean “only A”, “only B” or “both A and B”.
  • the expression “at least one of A or B” or “at least one of A and/or B” in the present disclosure may be interpreted as same as “at least one of A and B”.
  • At least one of A, B and C may mean “only A”, “only B”, “only C”, or “any combination of A, B and C”.
  • at least one of A, B or C or “at least one of A, B and/or C” may mean “at least one of A, B and C”.
  • parentheses used in the present disclosure may mean “for example”.
  • control information PDCCH
  • PDCCH PDCCH
  • PDCCH PDCCH
  • FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.
  • the 5G usage scenarios shown in FIG. 1 are only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in FIG. 1.
  • Three main requirement categories for 5G include (1) a category of enhanced mobile broadband (eMBB), (2) a category of massive machine type communication (mMTC), and (3) a category of ultra-reliable and low latency communications (URLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low latency communications
  • Partial use cases may require a plurality of categories for optimization and other use cases may focus only upon one key performance indicator (KPI).
  • KPI key performance indicator
  • eMBB far surpasses basic mobile Internet access and covers abundant bidirectional work and media and entertainment applications in cloud and augmented reality.
  • Data is one of 5G core motive forces and, in a 5G era, a dedicated voice service may not be provided for the first time.
  • voice will be simply processed as an application program using data connection provided by a communication system.
  • Main causes for increased traffic volume are due to an increase in the size of content and an increase in the number of applications requiring high data transmission rate.
  • a streaming service (of audio and video), conversational video, and mobile Internet access will be more widely used as more devices are connected to the Internet.
  • Cloud storage and applications are rapidly increasing in a mobile communication platform and may be applied to both work and entertainment.
  • the cloud storage is a special use case which accelerates growth of uplink data transmission rate.
  • 5G is also used for remote work of cloud. When a tactile interface is used, 5G demands much lower end-to-end latency to maintain user good experience.
  • Entertainment for example, cloud gaming and video streaming, is another core element which increases demand for mobile broadband capability. Entertainment is essential for a smartphone and a tablet in any place including high mobility environments such as a train, a vehicle, and an airplane.
  • Other use cases are augmented reality for entertainment and information search. In this case, the augmented reality requires very low latency and instantaneous data volume.
  • one of the most expected 5G use cases relates a function capable of smoothly connecting embedded sensors in all fields, i.e., mMTC. It is expected that the number of potential Internet-of-things (IoT) devices will reach 204 hundred million up to the year of 2020.
  • An industrial IoT is one of categories of performing a main role enabling a smart city, asset tracking, smart utility, agriculture, and security infrastructure through 5G.
  • URLLC includes a new service that will change industry through remote control of main infrastructure and an ultra-reliable/available low-latency link such as a self-driving vehicle.
  • a level of reliability and latency is essential to control a smart grid, automatize industry, achieve robotics, and control and adjust a drone.
  • 5G is a means of providing streaming evaluated as a few hundred megabits per second to gigabits per second and may complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS). Such fast speed is needed to deliver TV in resolution of 4K or more (6K, 8K, and more), as well as virtual reality and augmented reality.
  • Virtual reality (VR) and augmented reality (AR) applications include almost immersive sports games.
  • a specific application program may require a special network configuration. For example, for VR games, gaming companies need to incorporate a core server into an edge network server of a network operator in order to minimize latency.
  • Automotive is expected to be a new important motivated force in 5G together with many use cases for mobile communication for vehicles. For example, entertainment for passengers requires high simultaneous capacity and mobile broadband with high mobility. This is because future users continue to expect connection of high quality regardless of their locations and speeds.
  • Another use case of an automotive field is an AR dashboard.
  • the AR dashboard causes a driver to identify an object in the dark in addition to an object seen from a front window and displays a distance from the object and a movement of the object by overlapping information talking to the driver.
  • a wireless module enables communication between vehicles, information exchange between a vehicle and supporting infrastructure, and information exchange between a vehicle and other connected devices (e.g., devices accompanied by a pedestrian).
  • a safety system guides alternative courses of a behavior so that a driver may drive more safely drive, thereby lowering the danger of an accident.
  • the next stage will be a remotely controlled or self-driven vehicle. This requires very high reliability and very fast communication between different self-driven vehicles and between a vehicle and infrastructure. In the future, a self-driven vehicle will perform all driving activities and a driver will focus only upon abnormal traffic that the vehicle cannot identify.
  • Technical requirements of a self-driven vehicle demand ultra-low latency and ultra-high reliability so that traffic safety is increased to a level that cannot be achieved by human being.
  • a smart city and a smart home/building mentioned as a smart society will be embedded in a high-density wireless sensor network.
  • a distributed network of an intelligent sensor will identify conditions for costs and energy-efficient maintenance of a city or a home. Similar configurations may be performed for respective households. All of temperature sensors, window and heating controllers, burglar alarms, and home appliances are wirelessly connected. Many of these sensors are typically low in data transmission rate, power, and cost. However, real-time HD video may be demanded by a specific type of device to perform monitoring.
  • the smart grid collects information and connects the sensors to each other using digital information and communication technology so as to act according to the collected information. Since this information may include behaviors of a supply company and a consumer, the smart grid may improve distribution of fuels such as electricity by a method having efficiency, reliability, economic feasibility, production sustainability, and automation.
  • the smart grid may also be regarded as another sensor network having low latency.
  • Mission critical application is one of 5G use scenarios.
  • a health part contains many application programs capable of enjoying benefit of mobile communication.
  • a communication system may support remote treatment that provides clinical treatment in a faraway place. Remote treatment may aid in reducing a barrier against distance and improve access to medical services that cannot be continuously available in a faraway rural area. Remote treatment is also used to perform important treatment and save lives in an emergency situation.
  • the wireless sensor network based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • Wireless and mobile communication gradually becomes important in the field of an industrial application.
  • Wiring is high in installation and maintenance cost. Therefore, a possibility of replacing a cable with reconstructible wireless links is an attractive opportunity in many industrial fields.
  • it is necessary for wireless connection to be established with latency, reliability, and capacity similar to those of the cable and management of wireless connection needs to be simplified. Low latency and a very low error probability are new requirements when connection to 5G is needed.
  • Logistics and freight tracking are important use cases for mobile communication that enables inventory and package tracking anywhere using a location-based information system.
  • the use cases of logistics and freight typically demand low data rate but require location information with a wide range and reliability.
  • the communication system 1 includes wireless devices 100a to 100f, base stations (BSs) 200, and a network 300.
  • FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.
  • the BSs 200 and the network 300 may be implemented as wireless devices and a specific wireless device may operate as a BS/network node with respect to other wireless devices.
  • the wireless devices 100a to 100f represent devices performing communication using radio access technology (RAT) (e.g., 5G new RAT (NR)) or LTE) and may be referred to as communication/radio/5G devices.
  • RAT radio access technology
  • the wireless devices 100a to 100f may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device/server 400.
  • the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles.
  • the vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone).
  • UAV unmanned aerial vehicle
  • the XR device may include an AR/VR/Mixed Reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc.
  • the hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook).
  • the home appliance may include a TV, a refrigerator, and a washing machine.
  • the IoT device may include a sensor and a smartmeter.
  • the wireless devices 100a to 100f may be called user equipments (UEs).
  • a UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather/environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.
  • PDA personal digital assistant
  • PMP portable multimedia player
  • PC slate personal computer
  • tablet PC a tablet PC
  • ultrabook a vehicle, a vehicle having an autonomous
  • the UAV may be, for example, an aircraft aviated by a wireless control signal without a human being onboard.
  • the VR device may include, for example, a device for implementing an object or a background of the virtual world.
  • the AR device may include, for example, a device implemented by connecting an object or a background of the virtual world to an object or a background of the real world.
  • the MR device may include, for example, a device implemented by merging an object or a background of the virtual world into an object or a background of the real world.
  • the hologram device may include, for example, a device for implementing a stereoscopic image of 360 degrees by recording and reproducing stereoscopic information, using an interference phenomenon of light generated when two laser lights called holography meet.
  • the public safety device may include, for example, an image relay device or an image device that is wearable on the body of a user.
  • the MTC device and the IoT device may be, for example, devices that do not require direct human intervention or manipulation.
  • the MTC device and the IoT device may include smartmeters, vending machines, thermometers, smartbulbs, door locks, or various sensors.
  • the radio communication technologies implemented in the wireless devices in the present disclosure may include narrowband internet-of-things (NB-IoT) technology for low-power communication as well as LTE, NR and 6G.
  • NB-IoT technology may be an example of low power wide area network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and/or LTE Cat NB2, and may not be limited to the above-mentioned names.
  • LPWAN low power wide area network
  • the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology.
  • LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced machine type communication (eMTC).
  • eMTC enhanced machine type communication
  • LTE-M technology may be implemented in at least one of the various specifications, such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and may not be limited to the above-mentioned names.
  • the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and/or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names.
  • ZigBee technology may generate personal area networks (PANs) associated with small/low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.
  • PANs personal area networks
  • the medical device may be, for example, a device used for the purpose of diagnosing, treating, relieving, curing, or preventing disease.
  • the medical device may be a device used for the purpose of diagnosing, treating, relieving, or correcting injury or impairment.
  • the medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or a function.
  • the medical device may be a device used for the purpose of adjusting pregnancy.
  • the medical device may include a device for treatment, a device for operation, a device for (in vitro) diagnosis, a hearing aid, or a device for procedure.
  • the security device may be, for example, a device installed to prevent a danger that may arise and to maintain safety.
  • the security device may be a camera, a closed-circuit TV (CCTV), a recorder, or a black box.
  • CCTV closed-circuit TV
  • the FinTech device may be, for example, a device capable of providing a financial service such as mobile payment.
  • the FinTech device may include a payment device or a point of sales (POS) system.
  • POS point of sales
  • the weather/environment device may include, for example, a device for monitoring or predicting a weather/environment.
  • the wireless devices 100a to 100f may be connected to the network 300 via the BSs 200.
  • An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300.
  • the network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a beyond-5G network.
  • the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 200/network 300.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V)/vehicle-to-everything (V2X) communication).
  • the IoT device e.g., a sensor
  • the IoT device may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and/or between wireless device 100a to 100f and BS 200 and/or between BSs 200.
  • the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc.
  • the wireless devices 100a to 100f and the BSs 200/the wireless devices 100a to 100f may transmit/receive radio signals to/from each other through the wireless communication/connections 150a, 150b and 150c.
  • the wireless communication/connections 150a, 150b and 150c may transmit/receive signals through various physical channels.
  • various configuration information configuring processes e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/de-mapping
  • resource allocating processes for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.
  • FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.
  • a first wireless device 100 and a second wireless device 200 may transmit/receive radio signals to/from an external device through a variety of RATs (e.g., LTE and NR).
  • RATs e.g., LTE and NR
  • ⁇ the first wireless device 100 and the second wireless device 200 ⁇ may correspond to at least one of ⁇ the wireless device 100a to 100f and the BS 200 ⁇ , ⁇ the wireless device 100a to 100f and the wireless device 100a to 100f ⁇ and/or ⁇ the BS 200 and the BS 200 ⁇ of FIG. 1.
  • the first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure.
  • the processor(s) 102 may process information within the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106.
  • the processor(s) 102 may receive radio signals including second information/signals through the transceiver(s) 106 and then store information obtained by processing the second information/signals in the memory(s) 104.
  • the memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102.
  • the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure.
  • the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through one or more antennas 108.
  • Each of the transceiver(s) 106 may include a transmitter and/or a receiver.
  • the transceiver(s) 106 may be interchangeably used with radio frequency (RF) unit(s).
  • the first wireless device 100 may represent a communication modem/circuit/chip.
  • the second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure.
  • the processor(s) 202 may process information within the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206.
  • the processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204.
  • the memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202.
  • the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts described in the present disclosure.
  • the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208.
  • Each of the transceiver(s) 206 may include a transmitter and/or a receiver.
  • the transceiver(s) 206 may be interchangeably used with RF unit(s).
  • the second wireless device 200 may represent a communication modem/circuit/chip.
  • One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202.
  • the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY) layer, media access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, radio resource control (RRC) layer, and service data adaptation protocol (SDAP) layer).
  • layers e.g., functional layers such as physical (PHY) layer, media access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, radio resource control (RRC) layer, and service data adaptation protocol (SDAP) layer).
  • PHY physical
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • the one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and/or one or more service data unit (SDUs) according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceivers 106 and 206.
  • the one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers.
  • the one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • firmware or software may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions.
  • Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202.
  • the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and/or a set of commands.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands.
  • the one or more memories 104 and 204 may be configured by read-only memories (ROMs), random access memories (RAMs), electrically erasable programmable read-only memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof.
  • the one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, to one or more other devices.
  • the one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).
  • the one or more transceivers 106 and 206 may convert received radio signals/channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202.
  • the one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from the base band signals into the RF band signals.
  • the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • the transceivers 106 and 206 can up-convert OFDM baseband signals to a carrier frequency by their (analog) oscillators and/or filters under the control of the processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency.
  • the transceivers 106 and 206 may receive OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analog) oscillators and/or filters under the control of the transceivers 102 and 202.
  • a UE may operate as a transmitting device in uplink (UL) and as a receiving device in downlink (DL).
  • a BS may operate as a receiving device in UL and as a transmitting device in DL.
  • the first wireless device 100 acts as the UE
  • the second wireless device 200 acts as the BS.
  • the processor(s) 102 connected to, mounted on or launched in the first wireless device 100 may be configured to perform the UE behavior according to an implementation of the present disclosure or control the transceiver(s) 106 to perform the UE behavior according to an implementation of the present disclosure.
  • the processor(s) 202 connected to, mounted on or launched in the second wireless device 200 may be configured to perform the BS behavior according to an implementation of the present disclosure or control the transceiver(s) 206 to perform the BS behavior according to an implementation of the present disclosure.
  • a BS is also referred to as a node B (NB), an eNode B (eNB), or a gNB.
  • NB node B
  • eNB eNode B
  • gNB gNode B
  • FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.
  • the wireless device may be implemented in various forms according to a use-case/service (refer to FIG. 1).
  • wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units/portions, and/or modules.
  • each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140.
  • the communication unit 110 may include a communication circuit 112 and transceiver(s) 114.
  • the communication circuit 112 may include the one or more processors 102 and 202 of FIG. 2 and/or the one or more memories 104 and 204 of FIG. 2.
  • the transceiver(s) 114 may include the one or more transceivers 106 and 206 of FIG.
  • the control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of each of the wireless devices 100 and 200. For example, the control unit 120 may control an electric/mechanical operation of each of the wireless devices 100 and 200 based on programs/code/commands/information stored in the memory unit 130.
  • the control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit 110.
  • the additional components 140 may be variously configured according to types of the wireless devices 100 and 200.
  • the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit (e.g., audio I/O port, video I/O port), a driving unit, and a computing unit.
  • I/O input/output
  • the wireless devices 100 and 200 may be implemented in the form of, without being limited to, the robot (100a of FIG. 1), the vehicles (100b-1 and 100b-2 of FIG. 1), the XR device (100c of FIG. 1), the hand-held device (100d of FIG. 1), the home appliance (100e of FIG. 1), the IoT device (100f of FIG.
  • the wireless devices 100 and 200 may be used in a mobile or fixed place according to a use-example/service.
  • the entirety of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110.
  • Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements.
  • the control unit 120 may be configured by a set of one or more processors.
  • control unit 120 may be configured by a set of a communication control processor, an application processor (AP), an electronic control unit (ECU), a graphical processing unit, and a memory control processor.
  • the memory 130 may be configured by a RAM, a DRAM, a ROM, a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof.
  • FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.
  • wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units/portions, and/or modules.
  • the first wireless device 100 may include at least one transceiver, such as a transceiver 106, and at least one processing chip, such as a processing chip 101.
  • the processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104.
  • the memory 104 may be operably connectable to the processor 102.
  • the memory 104 may store various types of information and/or instructions.
  • the memory 104 may store a software code 105 which implements instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 105 may control the processor 102 to perform one or more protocols.
  • the software code 105 may control the processor 102 may perform one or more layers of the radio interface protocol.
  • the second wireless device 200 may include at least one transceiver, such as a transceiver 206, and at least one processing chip, such as a processing chip 201.
  • the processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204.
  • the memory 204 may be operably connectable to the processor 202.
  • the memory 204 may store various types of information and/or instructions.
  • the memory 204 may store a software code 205 which implements instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 205 may control the processor 202 to perform one or more protocols.
  • the software code 205 may control the processor 202 may perform one or more layers of the radio interface protocol.
  • FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.
  • a UE 100 may correspond to the first wireless device 100 of FIG. 2 and/or the first wireless device 100 of FIG. 4.
  • a UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 1112, a display 114, a keypad 116, a subscriber identification module (SIM) card 118, a speaker 120, and a microphone 122.
  • SIM subscriber identification module
  • the processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the processor 102 may be configured to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • Layers of the radio interface protocol may be implemented in the processor 102.
  • the processor 102 may include ASIC, other chipset, logic circuit and/or data processing device.
  • the processor 102 may be an application processor.
  • the processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a modem (modulator and demodulator).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • modem modulator and demodulator
  • processor 102 may be found in SNAPDRAGON TM series of processors made by Qualcomm ® , EXYNOS TM series of processors made by Samsung ® , A series of processors made by Apple ® , HELIO TM series of processors made by MediaTek ® , ATOM TM series of processors made by Intel ® or a corresponding next generation processor.
  • the memory 104 is operatively coupled with the processor 102 and stores a variety of information to operate the processor 102.
  • the memory 104 may include ROM, RAM, flash memory, memory card, storage medium and/or other storage device.
  • modules e.g., procedures, functions, etc.
  • the modules can be stored in the memory 104 and executed by the processor 102.
  • the memory 104 can be implemented within the processor 102 or external to the processor 102 in which case those can be communicatively coupled to the processor 102 via various means as is known in the art.
  • the transceiver 106 is operatively coupled with the processor 102, and transmits and/or receives a radio signal.
  • the transceiver 106 includes a transmitter and a receiver.
  • the transceiver 106 may include baseband circuitry to process radio frequency signals.
  • the transceiver 106 controls the one or more antennas 108 to transmit and/or receive a radio signal.
  • the power management module 110 manages power for the processor 102 and/or the transceiver 106.
  • the battery 112 supplies power to the power management module 110.
  • the display 114 outputs results processed by the processor 102.
  • the keypad 116 receives inputs to be used by the processor 102.
  • the keypad 16 may be shown on the display 114.
  • the SIM card 118 is an integrated circuit that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers). It is also possible to store contact information on many SIM cards.
  • IMSI international mobile subscriber identity
  • the speaker 120 outputs sound-related results processed by the processor 102.
  • the microphone 122 receives sound-related inputs to be used by the processor 102.
  • FIGs. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.
  • FIG. 6 illustrates an example of a radio interface user plane protocol stack between a UE and a BS
  • FIG. 7 illustrates an example of a radio interface control plane protocol stack between a UE and a BS.
  • the control plane refers to a path through which control messages used to manage call by a UE and a network are transported.
  • the user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported.
  • the user plane protocol stack may be divided into Layer 1 (i.e., a PHY layer) and Layer 2.
  • the control plane protocol stack may be divided into Layer 1 (i.e., a PHY layer), Layer 2, Layer 3 (e.g., an RRC layer), and a non-access stratum (NAS) layer.
  • Layer 1 i.e., a PHY layer
  • Layer 2 e.g., an RRC layer
  • NAS non-access stratum
  • Layer 1 Layer 2 and Layer 3 are referred to as an access stratum (AS).
  • the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP.
  • the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP.
  • the PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers.
  • the SDAP sublayer offers to 5G core network quality of service (QoS) flows.
  • QoS quality of service
  • the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing/de-multiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in case of carrier aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding.
  • HARQ hybrid automatic repeat request
  • a single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.
  • MAC Different kinds of data transfer services are offered by MAC.
  • multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information.
  • Each logical channel type is defined by what type of information is transferred.
  • Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only.
  • Broadcast control channel is a downlink logical channel for broadcasting system control information
  • PCCH paging control channel
  • PCCH is a downlink logical channel that transfers paging information
  • common control channel CCCH
  • DCCH dedicated control channel
  • DTCH Dedicated traffic channel
  • a DTCH can exist in both uplink and downlink.
  • BCCH can be mapped to broadcast channel (BCH); BCCH can be mapped to downlink shared channel (DL-SCH); PCCH can be mapped to paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH.
  • PCCH downlink shared channel
  • CCCH can be mapped to DL-SCH
  • DCCH can be mapped to DL-SCH
  • DTCH can be mapped to DL-SCH.
  • the RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged node (AM).
  • the RLC configuration is per logical channel with no dependency on numerologies and/or transmission durations.
  • the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).
  • the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (ROHC); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs and duplicate discard indication to lower layers.
  • ROIHC robust header compression
  • the main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.
  • the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS flow ID (QFI) in both DL and UL packets.
  • QFI QoS flow ID
  • a single protocol entity of SDAP is configured for each individual PDU session.
  • the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance and release of an RRC connection between the UE and NG-RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and control of the reporting; detection of and recovery from radio link failure; NAS message transfer to/from NAS from/to UE.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • mobility functions including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility
  • QoS management functions UE measurement reporting and control of the reporting; detection of and recovery from radio link failure; NAS
  • FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.
  • OFDM numerologies e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration
  • SCCS subcarrier spacing
  • TTI transmission time interval
  • symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).
  • Each frame is divided into two half-frames, where each of the half-frames has 5ms duration.
  • Each half-frame consists of 5 subframes, where the duration T sf per subframe is 1ms.
  • Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing.
  • Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix (CP). In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols.
  • a slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain.
  • a resource grid of N size,u grid,x * N RB sc subcarriers and N subframe,u symb OFDM symbols is defined, starting at common resource block (CRB) N start,u grid indicated by higher-layer signaling (e.g., RRC signaling), where N size,u grid,x is the number of resource blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.
  • N RB sc is the number of subcarriers per RB. In the 3GPP based wireless communication system, N RB sc is 12 generally.
  • Each element in the resource grid for the antenna port p and the subcarrier spacing configuration u is referred to as a resource element (RE) and one complex symbol may be mapped to each RE.
  • Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing a symbol location relative to a reference point in the time domain.
  • an RB is defined by 12 consecutive subcarriers in the frequency domain.
  • RBs are classified into CRBs and physical resource blocks (PRBs).
  • CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration u .
  • the center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A' which serves as a common reference point for resource block grids.
  • PRBs are defined within a bandwidth part (BWP) and numbered from 0 to N size BWP,i -1, where i is the number of the bandwidth part.
  • BWP bandwidth part
  • n PRB n CRB + N size BWP,i , where N size BWP,i is the common resource block where bandwidth part starts relative to CRB 0.
  • the BWP includes a plurality of consecutive RBs.
  • a carrier may include a maximum of N (e.g., 5) BWPs.
  • a UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.
  • the NR frequency band may be defined as two types of frequency range, i.e., FR1 and FR2.
  • the numerical value of the frequency range may be changed.
  • the frequency ranges of the two types may be as shown in Table 3 below.
  • FR1 may mean "sub 6 GHz range”
  • FR2 may mean “above 6 GHz range”
  • mmW millimeter wave
  • FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).
  • the term "cell” may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources.
  • a “cell” as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell” as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier.
  • the "cell” associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL component carrier (CC) and a UL CC.
  • the cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources.
  • the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.
  • CA two or more CCs are aggregated.
  • a UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities.
  • CA is supported for both contiguous and non-contiguous CCs.
  • the UE When CA is configured, the UE only has one RRC connection with the network.
  • one serving cell At RRC connection establishment/re-establishment/handover, one serving cell provides the NAS mobility information, and at RRC connection re-establishment/handover, one serving cell provides the security input.
  • This cell is referred to as the primary cell (PCell).
  • the PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure.
  • secondary cells can be configured to form together with the PCell a set of serving cells.
  • An SCell is a cell providing additional radio resources on top of special cell (SpCell).
  • the configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells.
  • the term SpCell refers to the PCell of the master cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG).
  • MCG master cell group
  • PSCell primary SCell
  • SCG secondary cell group
  • An SpCell supports PUCCH transmission and contention-based random access, and is always activated.
  • the MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells.
  • the SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC.
  • a UE in RRC_CONNECTED not configured with CA/DC there is only one serving cell comprised of the PCell.
  • serving cells is used to denote the set of cells comprised of the SpCell(s) and all SCells.
  • two MAC entities are configured in a UE: one for the MCG and one for the SCG.
  • FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.
  • Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data.
  • the MAC PDU is transmitted/received using radio resources through the PHY layer to/from an external device.
  • the MAC PDU arrives to the PHY layer in the form of a transport block.
  • the uplink transport channels UL-SCH and RACH are mapped to their physical channels physical uplink shared channel (PUSCH) and physical random access channel (PRACH), respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to physical downlink shared channel (PDSCH), physical broadcast channel (PBCH) and PDSCH, respectively.
  • uplink control information (UCI) is mapped to physical uplink control channel (PUCCH)
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • a MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.
  • the MAC entity In order to transmit on the sidelink shared channel (SL-SCH), the MAC entity must have at least one sidelink grant.
  • the MAC entity shall:
  • the received sidelink grant to be a configured sidelink grant occurring in those subframes starting at the beginning of the first available SC period which starts at least 4 subframes after the subframe in which the sidelink grant was received, overwriting a previously configured sidelink grant occurring in the same SC period, if available;
  • the MAC entity shall for each received sidelink grant:
  • the received sidelink grant to be a configured sidelink grant occurring in those subframes starting at the beginning of the first available SC period which starts at least 4 subframes after the subframe in which the sidelink grant was received, overwriting a previously configured sidelink grant received in the same subframe number but in a different radio frame as this configured sidelink grant occurring in the same SC period, if available;
  • the MAC entity shall for each sidelink grant to be selected:
  • the random function shall be such that each of the allowed selections can be chosen with equal probability
  • 2> use the selected sidelink grant to determine the set of subframes in which transmission of SCI and transmission of first transport block occur;
  • the selected sidelink grant to be a configured sidelink grant occurring in those subframes starting at the beginning of the first available SC period which starts at least 4 subframes after the subframe in which the sidelink grant was selected;
  • V2X vehicle-to-everything
  • the MAC entity shall for each carrier configured in sl - V2X - ConfigDedicated for which a sidelink grant has been dynamically received on the PDCCH for this TTI:
  • 2> use the received sidelink grant to determine the number of HARQ retransmissions and the set of subframes in which transmission of SCI and SL-SCH occur;
  • the MAC entity shall for each SL SPS configuration and for each carrier configured in sl - V2X -ConfigDedicated for which a sidelink grant has been received on the PDCCH addressed to SL semi-persistent scheduling V-RNTI for this TTI:
  • 3> use the received sidelink grant to determine the number of HARQ retransmissions and the set of subframes in which transmission of SCI and SL-SCH occur;
  • the MAC entity if the MAC entity is configured by upper layers to transmit using pool(s) of resources in one or multiple carriers based on sensing, or partial sensing, or random selection only if upper layers indicates that transmissions of multiple MAC PDUs are allowed, and the MAC entity selects to create a configured sidelink grant corresponding to transmissions of multiple MAC PDUs, and data is available in STCH associated with one or multiple carriers, the MAC entity shall for each sidelink process configured for multiple transmissions:
  • 4> use the previously selected sidelink grant for the number of transmissions of the MAC PDUs with the resource reservation interval to determine the set of subframes in which transmissions of SCI and SL-SCH occur;
  • 3> determine the order of the (re-)selected carriers, according to the decreasing order based on the highest priority of logical channels which are allowed on each (re-)selected carrier, and perform the following for each Sidelink process on each (re-)selected carrier according to the order:
  • the selected time and frequency resources shall fulfil the physical layer requirements, and the random function shall be such that each of the allowed selections can be chosen with equal probability;
  • 4> use the randomly selected resource to select a set of periodic resources spaced by the resource reservation interval for transmission opportunities of SCI and SL-SCH corresponding to the number of transmission opportunities of MAC PDUs;
  • the selected time and frequency resources shall fulfil the physical layer requirements, and the random function shall be such that each of the allowed selections can be chosen with equal probability;
  • 6> use the randomly selected resource to select a set of periodic resources spaced by the resource reservation interval for the other transmission opportunities of SCI and SL-SCH corresponding to the number of retransmission opportunities of the MAC PDUs;
  • 4> use the selected sidelink grant to determine the set of subframes in which transmissions of SCI and SL-SCH occur;
  • the MAC entity shall for a sidelink process:
  • 3> determine the order of the (re-)selected carriers, according to the decreasing order based on the highest priority of logical channels which are allowed on each (re-)selected carrier, and perform the following for each Sidelink process on each (re-)selected carrier according to the order:
  • the selected time and frequency resources shall fulfil the physical layer requirement, and the random function shall be such that each of the allowed selections can be chosen with equal probability;
  • the selected time and frequency resources shall fulfil the physical layer requirements, and the random function shall be such that each of the allowed selections can be chosen with equal probability;
  • 4> use the selected sidelink grant to determine the subframes in which transmission(s) of SCI and SL-SCH occur];
  • the UE For V2X sidelink communication, the UE should ensure the randomly selected time and frequency resources fulfill the latency requirement.
  • the MAC entity shall for each subframe:
  • a MCS which is, if configured, within the range that is configured by upper layers between minMCS - PSSCH and maxMCS - PSSCH included in pssch-TxConfigList associated with the selected transmission format and, if configured by upper layers, overlapped between minMCS - PSSCH and maxMCS - PSSCH indicated in cbr - pssch - TxConfigList associated with the selected transmission format for the highest priority of the sidelink logical channel(s) in the MAC PDU and the CBR measured by lower layers if CBR measurement results are available or the corresponding defaultTxConfigIndex configured by upper layers if CBR measurement results are not available;
  • V2X sidelink communication deliver the configured sidelink grant, the associated HARQ information and the value of the highest priority of the sidelink logical channel(s) in the MAC PDU to the sidelink HARQ entity for this subframe;
  • Section 5.14.1.2 of 3GPP TS 36.321 V15.6.0 can be referred.
  • the MAC entity is configured by upper layers to transmit using pool(s) of resources on one or multiple carriers. For each carrier, there is one sidelink HARQ entity at the MAC entity for transmission on SL-SCH, which maintains a number of parallel sidelink processes.
  • the maximum number of transmitting sidelink processes associated with each sidelink HARQ entity is 8.
  • a sidelink process may be configured for transmissions of multiple MAC PDUs.
  • the maximum number of transmitting sidelink processes associated with each sidelink HARQ entity is 2.
  • a delivered and configured sidelink grant and its associated HARQ information are associated with a sidelink process.
  • the sidelink HARQ entity shall
  • the sidelink process is associated with a HARQ buffer.
  • the sequence of redundancy versions is 0, 2, 3, 1.
  • the variable CURRENT_IRV is an index into the sequence of redundancy versions. This variable is updated modulo 4.
  • New transmissions and retransmissions either for a given SC period in sidelink communication or in V2X sidelink communication are performed on the resource indicated in the sidelink grant and with the MCS selected.
  • the process If the sidelink process is configured to perform transmissions of multiple MAC PDUs for V2X sidelink communication the process maintains a counter SL_RESOURCE_RESELECTION_COUNTER. For other configurations of the sidelink process, this counter is not available.
  • the sidelink process shall:
  • the sidelink process shall:
  • the sidelink process shall:
  • the transmission of the MAC PDU for V2X sidelink communication is prioritized over uplink transmissions if the following conditions are met:
  • TX carrier (re-)selection for V2X sidelink communication is described. Section 5.14.1.5 of 3GPP TS 36.321 V15.6.0 can be referred.
  • the MAC entity shall consider a CBR of a carrier to be one measured by lower layers if CBR measurement results are available, or the corresponding defaultTxConfigIndex configured by upper layers for the carrier if CBR measurement results are not available.
  • the MAC entity shall:
  • the MAC entity shall:
  • 3> select one or more carrier(s) and associated pool(s) of resources among the candidate carriers with increasing order of CBR from the lowest CBR.
  • At least the following two SL resource allocation modes may be defined.
  • BS schedules SL resource(s) to be used by UE for SL transmission(s).
  • UE determines, i.e. BS does not schedule, SL transmission resource(s) within SL resources configured by BS/network or pre-configured SL resources.
  • SL resource allocation Mode 2 covers:
  • a) UE autonomously selects SL resource for transmission
  • UE assists SL resource selection for other UE(s), a functionality which can be part of a), c), d)
  • UE is configured with NR configured grant (Type-1 like) for SL transmission
  • UE schedules SL transmissions of other UEs
  • Resource allocation mode 2 supports reservation of SL resources at least for blind retransmission.
  • Sensing- and resource (re-)selection-related procedures are supported for resource allocation mode 2.
  • the sensing procedure considered is defined as decoding sidelink control information (SCI(s)) from other UEs and/or SL measurements.
  • Decoding SCI(s) in this procedure provides at least information on SL resources indicated by the UE transmitting the SCI.
  • the sensing procedure uses a L1 SL reference signal received power (RSRP) measurement based on SL demodulation reference signal (DMRS) when the corresponding SCI is decoded.
  • RSRP L1 SL reference signal received power
  • DMRS SL demodulation reference signal
  • the resource (re-)selection procedure considered uses the results of the sensing procedure to determine resource(s) for SL transmission.
  • SL sensing and resource selection procedures may be considered in the context of a semi-persistent scheme where resource(s) are selected for multiple transmissions of different transport blocks (TBs) and a dynamic scheme where resource(s) are selected for each TB transmission.
  • TBs transport blocks
  • mode 2(c) assumes a (pre-)configuration of single or multiple SL transmission patterns, defined on each SL resource pool.
  • mode 2(c) assumes that gNB configuration indicates single or multiple SL transmission patterns, defined on each SL resource pool. If there is a single pattern configured to a transmitting UE, there is no sensing procedure executed by UE, while if multiple patterns are configured, there is a possibility of a sensing procedure.
  • a pattern is defined by the size and position(s) of the resource in time and frequency, and the number of resources.
  • mode 2(d) in the context of group-based SL communication, it supported for UE-A to inform its serving gNB about members UE-B, UE-C, and so on of a group, and for the gNB to provide individual resource pool configurations and/or individual resource configurations to each group member through UE-A.
  • UE-A cannot modify the configurations, and there is no direct connection required between any member UE and the gNB.
  • Higher-layer only signaling is used to provide the configurations. Such functionality is up to UE capability(ies).
  • the TX UE may transmit sidelink UE information including traffic pattern of Service, TX carriers and/or RX carriers mapped to service, QoS information related to service (e.g. 5QI, ProSe-per-packet priority (PPPP), ProSe-per-packet reliability (PPPR), QoS class identifier (QCI) value), and destination related to service.
  • sidelink UE information including traffic pattern of Service, TX carriers and/or RX carriers mapped to service, QoS information related to service (e.g. 5QI, ProSe-per-packet priority (PPPP), ProSe-per-packet reliability (PPPR), QoS class identifier (QCI) value
  • destination related to service e.g. 5QI, ProSe-per-packet priority (PPPP), ProSe-per-packet reliability (PPPR), QoS class identifier (QCI) value
  • the gNB After receiving the sidelink UE information, the gNB constructs sidelink configuration at least including one or more resource pools for service and sidelink buffer status reporting (BSR) configuration.
  • BSR sidelink buffer status reporting
  • the gNB signals the sidelink configuration to the TX UE and then the TX UE configures lower layers with sidelink configuration.
  • the TX UE triggers scheduling request (SR), so that the TX UE transmits PUCCH resource. If PUCCH resource is not configured, the TX UE performs random access procedure as the SR. If an uplink grant is given at a result of the SR, the TX UE transmits sidelink BSR to the gNB.
  • the sidelink BSR indicates at least a destination index, a logical channel group (LCG), and a buffer size corresponding to the destination.
  • LCG logical channel group
  • the gNB After receiving the sidelink BSR, the gNB transmits a sidelink grant to the TX UE, e.g., by sending downlink control information (DCI) in PDCCH.
  • the DCI may include an allocated sidelink resource. If the TX UE receives the DCI, the TX UE uses the sidelink grant for transmission to the RX UE.
  • the TX UE if the TX UE is configured for UE autonomous scheduling of sidelink resource allocation (e.g., mode 2) regardless of RRC state, the TX UE autonomously select or reselect sidelink resources to create a sidelink grant used for transmission to the RX UE.
  • sidelink resource allocation e.g., mode 2
  • the TX UE autonomously select or reselect sidelink resources to create a sidelink grant used for transmission to the RX UE.
  • UE may reserve multiple resources for multiple retransmissions of a packet for sidelink.
  • HARQ feedback may be applied to sidelink transmission. That is, a first UE transmits sidelink data to a second UE, and the second UE can transmit feedback (e.g., HARQ-ACK) to the first UE in response to the sidelink data.
  • HARQ-ACK feedback
  • UE may not need remaining resources for retransmissions of a packet.
  • UE currently there is no mechanism for UE to utilize the remaining resources.
  • FIG. 10 shows an example of a method performed by a first wireless device (e.g., transmitting (TX) wireless device) configured to operate in a wireless communication system to which implementations of the present disclosure is applied.
  • a first wireless device e.g., transmitting (TX) wireless device
  • TX transmitting
  • a first wireless device reserves a set of resources including at least a first resource and a second resource.
  • the first wireless device may reserve a set of resources including for initial transmission and/or retransmission.
  • the set of resources may be reserved according to some operations described in “Sidelink (SL) grant reception and sidelink control information (SCI) transmission” above.
  • the first wireless device may set a maximum number of retransmissions of the data unit.
  • the first wireless device may set a delay requirement of the MAC PDU based on QoS requirement of a logical channel for which data is carried by the data unit.
  • step S1010 the first wireless device constructs a data unit based on the first resource.
  • the data unit may be first MAC PDU.
  • the first wireless device may deliver at least one of the first resource and the second resource to the HARQ process.
  • the first wireless device may deliver some of resources for initial transmission and/or retransmissions of the first MAC PDU to the HARQ process from the set of resources.
  • the HARQ process may be a sidelink process for sidelink transmission.
  • the data unit may be constructed according to some operations described in "Sidelink HARQ operation" above.
  • step S1020 the first wireless device transmits, to a second wireless device, the data unit by using the first resource in the HARQ process.
  • the transmission of the data unit by using the first resource may correspond to initial transmission of the data unit.
  • the first wireless device may perform initial transmission of the first MAC PDU from the HARQ process.
  • the transmission of the data unit by using the first resource may correspond to retransmission of the data unit.
  • the first wireless device may perform retransmission of the first MAC PDU from the HARQ process.
  • the data unit may be transmitted according to some operations described in "Sidelink HARQ operation" above.
  • step S1030 the first wireless device receives an ACK in response to the data unit.
  • step S1040 the first wireless device clears the second resource to be used for retransmission of the data unit.
  • step S1050 the first wireless device flushes a buffer of the HARQ process.
  • the first wireless device when the first wireless device receives ACK in response to transmission of the first MAC PDU, and there is a grant valid for retransmission(s) of the first MAC PDU, the first wireless device clears only remaining resource(s) that has been reserved for retransmission(s) of the first MAC PDU among the set of resources (e.g., the second resource to be used for retransmission of the data unit among the set of resources) and flushes a buffer of the HARQ process.
  • the set of resources e.g., the second resource to be used for retransmission of the data unit among the set of resources
  • the first wireless device clears the resource(s) that has been reserved for retransmission(s) of the MAC PDU from the configured sidelink grant associated to the sidelink process, if available.
  • the first wireless device clears the PSCCH duration(s) and PSSCH duration(s) corresponding to retransmission(s) of the MAC PDU from the configured sidelink grant and/or the selected sidelink grant.
  • the first wireless device may further trigger a transmission (TX) resource reselection procedure and/or a TX carrier reselection procedure.
  • TX transmission
  • the first wireless device may further trigger a transmission (TX) resource reselection procedure and/or a TX carrier reselection procedure.
  • the TX resource reselection procedure and/or a TX carrier reselection procedure may be triggered according to some operations described in "TX carrier (re-)selection for V2X sidelink communication" above.
  • the first wireless device may flush the buffer of the HARQ process and store a second MAC PDU to use the remaining resource(s) for transmission of the second MAC PDU.
  • the first wireless device may re-allocate the remaining resource(s) from the first HARQ process to a second HARQ process.
  • the first wireless device may clear all of the set of resources, if available, and trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • the first wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the first wireless device.
  • first wireless device 100 shown in FIG. 2 may be performed by first wireless device 100 shown in FIG. 2, the wireless device 100 shown in FIG. 3, the first wireless device 100 shown in FIG. 4 and/or the UE 100 shown in FIG. 5.
  • the first wireless device comprises at least one transceiver, at least processor, and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations below.
  • the operations comprise reserving a set of resources including at least a first resource and a second resource.
  • the first wireless device may reserve a set of resources including for initial transmission and/or retransmission.
  • the set of resources may be reserved according to some operations described in “Sidelink (SL) grant reception and sidelink control information (SCI) transmission” above.
  • the first wireless device may set a maximum number of retransmissions of the data unit.
  • the first wireless device may set a delay requirement of the MAC PDU based on QoS requirement of a logical channel for which data is carried by the data unit.
  • the operations further comprise constructing a data unit based on the first resource.
  • the data unit may be first MAC PDU.
  • the first wireless device may deliver at least one of the first resource and the second resource to the HARQ process.
  • the first wireless device may deliver some of resources for initial transmission and/or retransmissions of the first MAC PDU to the HARQ process from the set of resources.
  • the HARQ process may be a sidelink process for sidelink transmission.
  • the data unit may be constructed according to some operations described in "Sidelink HARQ operation" above.
  • the operations further comprise transmitting, to a second wireless device, the data unit by using the first resource in the HARQ process.
  • the transmission of the data unit by using the first resource may correspond to initial transmission of the data unit.
  • the first wireless device may perform initial transmission of the first MAC PDU from the HARQ process.
  • the transmission of the data unit by using the first resource may correspond to retransmission of the data unit.
  • the first wireless device may perform retransmission of the first MAC PDU from the HARQ process.
  • the data unit may be transmitted according to some operations described in "Sidelink HARQ operation" above.
  • the operations further comprise receiving an ACK in response to the data unit.
  • the operations further comprise clearing the second resource to be used for retransmission of the data unit.
  • the operations further comprise flushing a buffer of the HARQ process.
  • the first wireless device when the first wireless device receives ACK in response to transmission of the first MAC PDU, and there is a grant valid for retransmission(s) of the first MAC PDU, the first wireless device clears only remaining resource(s) that has been reserved for retransmission(s) of the first MAC PDU among the set of resources (e.g., the second resource to be used for retransmission of the data unit among the set of resources) and flushes a buffer of the HARQ process.
  • the set of resources e.g., the second resource to be used for retransmission of the data unit among the set of resources
  • the first wireless device may further trigger a transmission (TX) resource reselection procedure and/or a TX carrier reselection procedure.
  • TX transmission
  • the first wireless device may further trigger a transmission (TX) resource reselection procedure and/or a TX carrier reselection procedure.
  • the TX resource reselection procedure and/or a TX carrier reselection procedure may be triggered according to some operations described in "TX carrier (re-)selection for V2X sidelink communication" above.
  • the first wireless device may flush the buffer of the HARQ process and store a second MAC PDU to use the remaining resource(s) for transmission of the second MAC PDU.
  • the first wireless device may re-allocate the remaining resource(s) from the first HARQ process to a second HARQ process.
  • the first wireless device may clear all of the set of resources, if available, and trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • the method in perspective of the first wireless device described above in FIG. 10 may be performed by control of the processor 102 included in the first wireless device 100 shown in FIG. 2, by control of the communication unit 110 and/or the control unit 120 included in the wireless device 100 shown in FIG. 3, by control of the processor 102 included in the first wireless device 100 shown in FIG. 4 and/or by control of the processor 102 included in the UE 100 shown in FIG. 5.
  • an apparatus for configured to operate in a wireless communication system comprises at least processor, and at least one computer memory operably connectable to the at least one processor.
  • the at least one processor is configured to perform operations comprising reserving a set of resources including at least a first resource and a second resource, constructing a data unit based on the first resource, controlling to transmit, to a second wireless device, the data unit by using the first resource in a HARQ process, obtaining an ACK in response to the data unit, clearing the second resource to be used for retransmission of the data unit, and flushing a buffer of the HARQ process.
  • the method in perspective of the first wireless device described above in FIG. 10 may be performed by a software code 105 stored in the memory 104 included in the first wireless device 100 shown in FIG. 4.
  • At least one computer readable medium stores instructions that, based on being executed by at least one processor, perform operations comprising reserving a set of resources including at least a first resource and a second resource, constructing a data unit based on the first resource, controlling to transmit, to a second wireless device, the data unit by using the first resource in a HARQ process, obtaining an ACK in response to the data unit, clearing the second resource to be used for retransmission of the data unit, and flushing a buffer of the HARQ process.
  • CCM computer readable medium
  • FIG. 11 shows an example of performing data transmission by a UE to which implementations of the present disclosure is applied.
  • step S1100 the UE reserves a set of resources for new transmission(s) and/or retransmissions.
  • the UE may set a maximum number of retransmissions and/or a delay requirement of a first MAC PDU carrying data of a logical channel based on QoS requirement of the logical channel.
  • step S1110 the UE delivers some of resources for new transmission and/or re-transmissions of the first MAC PDU to a first HARQ process from the set of resources.
  • HARQ process may be a sidelink process in sidelink transmission.
  • step S1120 the UE performs new transmission and/or re-transmission of the first MAC PDU from the HARQ process.
  • step S1130 upon receiving receives ACK to the (re-)transmission of the first MAC PDU, and there is a grant valid for retransmission(s) of the first MAC PDU, the UE flushes the buffer of the HARQ process and clears only the remaining resource(s) that has been reserved for retransmission(s) of the first MAC PDU among the set of resources.
  • the UE may further trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • the number of retransmissions of the first MAC PDU stored in a sidelink process may reach the maximum number of retransmissions.
  • the delay requirement of the first MAC PDU may be fulfilled. That is, upon receiving receives ACK to the (re-)transmission of the first MAC PDU, if the number of retransmissions of the first MAC PDU stored in a sidelink process reaches the maximum number of retransmissions and/or delay requirement of the first MAC PDU is fulfilled, and there is a grant valid for retransmission(s) of the first MAC PDU, the UE may flush the buffer of the HARQ process and clear only the remaining resource(s) that has been reserved for retransmission(s) of the first MAC PDU among the set of resources.
  • the UE may flush the buffer of the HARQ process and store a second MAC PDU to use the remaining resource(s) for transmission of the second MAC PDU.
  • the UE may re-allocate the remaining resource(s) from the first HARQ process to a second HARQ process.
  • the UE may clear the set of resources, if available, and trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • FIG. 12 shows an example of sidelink data transmission of a MAC PDU from a UE to which implementations of the present disclosure is applied.
  • step S1202 if the TX UE is in RRC_CONNECTED and configured for network scheduled sidelink resource allocation (e.g., Mode 1), the TX UE may receive a grant from a network, e.g. via DCI in PDCCH.
  • the DCI may include an allocated sidelink resource.
  • the TX UE may use the sidelink grant for transmission to the RX UE.
  • the TX UE may autonomously select or reselect sidelink resources from a resource pool to create a sidelink grant used for transmission to the RX UE.
  • RRC state e.g., Mode 2
  • step S1204 upon receiving a resource pool from the network, the TX UE reserves a set of resources for new transmission(s) and/or retransmissions from the pool of the resources.
  • the reserved set of the resources may be considered as a configured sidelink grant.
  • the TX UE may receive and activate configured sidelink grant type 1 and/or 2.
  • the TX UE creates/constructs a first MAC PDU.
  • the TX UE may set a maximum number of retransmissions of the first MAC PDU.
  • the TX UE may set a delay requirement of the first MAC PDU carrying data of a logical channel based on QoS requirement of the logical channel.
  • the TX UE may deliver some of the resources for new transmission and/or re-transmissions of the first MAC PDU to a first HARQ process from the set of resources.
  • HARQ process may be a sidelink process in sidelink transmission.
  • step S1210 the TX UE performs new transmission and/or re-transmission (i.e., HARQ transmission) of the first MAC PDU from the first HARQ process.
  • new transmission and/or re-transmission i.e., HARQ transmission
  • step S1212 the TX UE performs first transmission (e.g., initial transmission) of the first MAC PDU to the RX UE via PSCCH/PSSCH.
  • step S1214 the TX UE receives non-acknowledgement (NACK) in response to the first transmission of the first MAC PDU.
  • NACK non-acknowledgement
  • step S1216 the TX UE performs second transmission (e.g., retransmission) of the first MAC PDU to the RX UE via PSCCH/PSSCH.
  • step S1218 the TX UE receives acknowledgement (e.g., positive ACK) in response to the second transmission of the first MAC PDU.
  • acknowledgement e.g., positive ACK
  • step S1220 when the TX UE receives ACK to the (re-)transmission of the first MAC PDU, if the number of retransmissions of the first MAC PDU stored in a sidelink process reaches the maximum number of retransmissions and/or the delay requirement of the first MAC PDU is fulfilled, and there is a grant valid for retransmission(s) of the first MAC PDU, the TX UE triggers TX resource (re-)selection and/or TX carrier (re-)selection. The TX UE performs relocation of remaining resources.
  • the TX UE may flush the buffer of the HARQ process and store a second MAC PDU to use the remaining resource(s) for transmission of the second MAC PDU.
  • the TX UE may re-allocate the remaining resource(s) from the first HARQ process to a second HARQ process.
  • the TX UE may clear only the remaining resource(s) that has been reserved for retransmission(s) of the first MAC PDU among the set of resources, if available, and trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • the TX UE may clear the set of resources, if available, and trigger TX resource (re-)selection and/or TX carrier (re-)selection.
  • the TX UE may construct a MAC PDU, e.g., second MAC PDU.
  • the second MAC PDU may be constructed when the TX UE determines to use the remaining resource(s) for transmission of the second MAC PDU.
  • the TX UE may perform first transmission (e.g., initial transmission) of the second MAC PDU to the RX UE via PSCCH/PSSCH.
  • FIG. 12 for sidelink transmission is merely exemplary, and is not limited thereto.
  • the present disclosure can be applied to uplink data transmission as well.
  • a method performed by a second wireless device configured to operate in a wireless communication system includes receiving, from a first wireless device, a data unit by using a first resource in a HARQ process, and transmitting, to the first wireless device, ACK in response to the data unit.
  • a set of resources including at least the first resource and a second resource is reserved. After the ACK is received by the first wireless device, the second resource to be used for retransmission of the data unit is cleared, and a buffer of the HARQ process is flushed.
  • the method in perspective of the second wireless device described above may be performed by second wireless device 200 shown in FIG. 2, the wireless device 100 shown in FIG. 3, the second wireless device 200 shown in FIG. 4 and/or the UE 100 shown in FIG. 5.
  • the second wireless device comprises at least one transceiver, at least processor, and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising receiving, from a first wireless device, a data unit by using a first resource in a HARQ process, and transmitting, to the first wireless device, ACK in response to the data unit.
  • a set of resources including at least the first resource and a second resource is reserved. After the ACK is received by the first wireless device, the second resource to be used for retransmission of the data unit is cleared, and a buffer of the HARQ process is flushed.
  • the present disclosure can have various advantageous effects.
  • a UE can efficiently utilize resources for sidelink retransmissions based on HARQ feedback.
  • a UE can perform resource reselection for retransmissions based on HARQ feedback for sidelink transmissions, in particular when retransmission resources are reserved for the packet.
  • a system can provide efficient use of resources for a UE performing resource reservation for retransmissions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de libération de ressource de retransmission sur la base d'un accusé de réception de demande automatique de répétition hybride (HARQ-ACK) dans un système de communication sans fil. Un premier dispositif sans fil conçu pour fonctionner dans un système de communication sans fil transmet, à un second dispositif sans fil, une unité de données au moyen d'une première ressource lors d'un processus de demande de répétition automatique hybride (HARQ). Lors de la réception d'un accusé de réception (ACK) en réponse à l'unité de données, le premier dispositif sans fil libère une seconde ressource devant être utilisée pour la retransmission de l'unité de données, et vide une mémoire tampon du processus de HARQ.
EP20875121.4A 2019-10-10 2020-10-06 Libération de ressource de retransmission sur la base d'un harq-ack Withdrawn EP4011018A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201962913718P 2019-10-10 2019-10-10
PCT/KR2020/013571 WO2021071200A1 (fr) 2019-10-10 2020-10-06 Libération de ressource de retransmission sur la base d'un harq-ack

Publications (2)

Publication Number Publication Date
EP4011018A1 true EP4011018A1 (fr) 2022-06-15
EP4011018A4 EP4011018A4 (fr) 2022-09-28

Family

ID=75437327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20875121.4A Withdrawn EP4011018A4 (fr) 2019-10-10 2020-10-06 Libération de ressource de retransmission sur la base d'un harq-ack

Country Status (3)

Country Link
US (1) US20240048284A1 (fr)
EP (1) EP4011018A4 (fr)
WO (1) WO2021071200A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114008955A (zh) * 2019-06-12 2022-02-01 联想（新加坡）私人有限公司 对用于混合自动重传请求过程的新数据指示符进行响应
EP4075695A4 (fr) * 2019-12-31 2022-12-21 Huawei Technologies Co., Ltd. Procédé et appareil de rétroaction de données
CN113556217B (zh) * 2021-09-18 2022-01-25 深圳传音控股股份有限公司 通信方法、网络设备、终端设备及存储介质

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016122162A1 (fr) * 2015-01-28 2016-08-04 Lg Electronics Inc. Procédé de transmission de pdu de mac sur une sl-dch dans un système de communication d2d et dispositif associé
CN107277923B (zh) * 2016-04-01 2020-01-14 华硕电脑股份有限公司 无线通信系统中改善使用配置资源传输的方法及用户设备
US20180279275A1 (en) * 2017-03-23 2018-09-27 Asustek Computer Inc. Method and apparatus of facilitating reporting assistance information for sidelink service in a wireless communication system
WO2019066558A1 (fr) * 2017-09-29 2019-04-04 Lg Electronics Inc. Procédé et appareil permettant de vider une mémoire tampon harq dans un système de communication sans fil
CN114097257A (zh) * 2019-07-01 2022-02-25 联想（新加坡）私人有限公司 用于nr车辆通信的sl harq缓冲区管理

Also Published As

Publication number Publication date
US20240048284A1 (en) 2024-02-08
EP4011018A4 (fr) 2022-09-28
WO2021071200A1 (fr) 2021-04-15

Similar Documents

Publication Publication Date Title
WO2020197306A1 (fr) Activation d'une configuration de groupe de cellules secondaires lors d'une détection de défaillance de groupe de cellules maîtresses
WO2021091302A1 (fr) Procédé et appareil permettant de sélectionner une ressource de liaison latérale pour un rapport d(informations d'état de canal (csi) de laision latérale dans un système de communication sans fil
WO2020122617A1 (fr) Procédé de transmission de signaux de liaison montante et dispositif associé
WO2021091294A1 (fr) Procédé et appareil pour indiquer une défaillance de liaison radio de liaison latérale dans un système de communication sans fil
WO2021071267A1 (fr) Procédé et appareil de transmission sur la base d'une exigence de qos dans un système de communication sans fil
WO2020222587A1 (fr) Déclenchement et annulation d'une demande d'ordonnancement de liaison latérale en fonction de l'état de différentes liaisons directes
WO2021206352A1 (fr) Réception discontinue de signal de liaison descendante pour transmission sur liaison latérale
WO2020222505A1 (fr) Reconfiguration de sdap basée sur une transition d'état dans une communication de liaison latérale
WO2020159134A1 (fr) Reconstruction d'unité de données
WO2021015561A1 (fr) Procédé et appareil de rapport de mesure pendant un transfert intercellulaire de pcell conditionnel dans un système de communication sans fil
WO2021015560A1 (fr) Procédé et appareil de gestion de cellules secondaires lors d'un transfert conditionnel de cellules primaires dans un système de communication sans fil
WO2022015015A1 (fr) Opération de drx de liaison latérale sur la base d'une attribution de ressources
WO2021071200A1 (fr) Libération de ressource de retransmission sur la base d'un harq-ack
WO2021149939A1 (fr) Procédé et appareil permettant de commuter entre une monodiffusion et une multidiffusion dans un système de communication sans fil
WO2021085998A1 (fr) Déclenchement d'une porteuse de transmission ou d'une resélection de ressources
WO2021086029A1 (fr) Établissement de priorité de canal logique sur la base d'une rétroaction harq
WO2020222507A1 (fr) Configuration sdap pour destination dans une communication de liaison latérale
WO2021230644A1 (fr) Transmissions périodiques pour autorisation configurée
WO2020166956A1 (fr) Gestion de portée de communication requise minimale dans une communication de liaison latérale
WO2022015070A1 (fr) Attribution d'identifiants de processus harq à différents équipements utilisateurs ou destinations différentes
WO2021066500A1 (fr) Reconfiguration de configuration de liaison latérale et attribution de ressources de liaison latérale
WO2022015037A1 (fr) Opération drx de liaison latérale basée sur de multiples configurations drx et une priorisation
WO2021071268A1 (fr) Procédé et appareil permettant de gérer une commutation de bwp basée sur une priorité dans un système de communication sans fil
WO2021085990A1 (fr) Procédé et appareil pour éliminer des ressources de retransmission sur la base d'un accusé de réception
WO2020222563A1 (fr) Procédé et appareil de commande de rapport d'état de tampon de liaison latérale reposant sur des liaisons directes différentes dans un système de communication à liaisons latérales

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20220308

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

A4 Supplementary search report drawn up and despatched

Effective date: 20220829

RIC1 Information provided on ipc code assigned before grant

Ipc: H04W 72/12 20090101ALI20220823BHEP

Ipc: H04W 72/02 20090101ALI20220823BHEP

Ipc: H04W 28/26 20090101ALI20220823BHEP

Ipc: H04W 4/40 20180101ALI20220823BHEP

Ipc: H04L 1/18 20060101AFI20220823BHEP

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20230222

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20240216